WO2022065676A1 - Appareil et procédé de calcul d'une résistance de batterie - Google Patents

Appareil et procédé de calcul d'une résistance de batterie Download PDF

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Publication number
WO2022065676A1
WO2022065676A1 PCT/KR2021/010384 KR2021010384W WO2022065676A1 WO 2022065676 A1 WO2022065676 A1 WO 2022065676A1 KR 2021010384 W KR2021010384 W KR 2021010384W WO 2022065676 A1 WO2022065676 A1 WO 2022065676A1
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WIPO (PCT)
Prior art keywords
battery pack
insulation resistance
voltage
battery
resistance
Prior art date
Application number
PCT/KR2021/010384
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English (en)
Korean (ko)
Inventor
윤호병
Original Assignee
주식회사 엘지에너지솔루션
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020200122615A external-priority patent/KR102673263B1/ko
Application filed by 주식회사 엘지에너지솔루션 filed Critical 주식회사 엘지에너지솔루션
Priority to US18/017,814 priority Critical patent/US20230280409A1/en
Priority to CN202180057683.2A priority patent/CN116194786A/zh
Priority to JP2023504608A priority patent/JP7475769B2/ja
Priority to EP21872708.9A priority patent/EP4174506A4/fr
Publication of WO2022065676A1 publication Critical patent/WO2022065676A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • G01R27/08—Measuring resistance by measuring both voltage and current
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/52—Testing for short-circuits, leakage current or ground faults
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • An object of the present invention is to provide an apparatus and method for calculating battery resistance for calculating the insulation resistance of a battery.
  • the secondary battery is a battery capable of charging and discharging, and includes all of the conventional Ni/Cd batteries, Ni/MH batteries, and the latest lithium ion batteries.
  • lithium ion batteries have an advantage in that their energy density is much higher than that of conventional Ni/Cd batteries and Ni/MH batteries.
  • lithium ion batteries can be manufactured in a small size and light weight, so they are used as power sources for mobile devices.
  • the lithium ion battery is receiving attention as a next-generation energy storage medium as the range of use has been expanded as a power source for electric vehicles.
  • the secondary battery is generally used as a battery pack including a battery module in which a plurality of battery cells are connected in series and/or in parallel.
  • the state and operation of the battery pack are managed and controlled by the battery management system.
  • a high-voltage battery pack used in an energy storage system (ESS), an electric vehicle, or the like needs to maintain a certain level of insulation between the battery pack and the chassis in order to prevent the battery pack from being discharged or a user's electric shock.
  • a battery management system performs an insulation resistance measurement function between a battery pack and a chassis through an insulation resistance measurement circuit.
  • the measurement resistance is connected between the positive (+, -) of the battery pack and the chassis, and the insulation resistance is calculated by measuring the voltage after connecting the battery pack positive and the chassis sequentially through a switch. method was used.
  • the measuring resistor or switching element included in the insulation resistance measuring circuit is connected between the high voltage battery and the chassis, clearance or creepage has to be considered, so bulky and expensive parts are mostly used. .
  • high-spec parts are required.
  • the present invention has been devised to solve the above problems, and by connecting the measurement circuit only between one of the (+) or (-) terminals of the battery pack and the chassis, the size of the battery management system is reduced and the cost is reduced.
  • An object of the present invention is to provide an apparatus and method for calculating battery resistance that can be used.
  • an apparatus and method for calculating battery resistance according to the present invention aims to realize performance substantially equivalent to that of an existing measurement circuit even if one section of the measurement circuit is removed.
  • a battery resistance calculating apparatus includes a measuring circuit connected between one of a (+) terminal and a (-) terminal of a battery pack, a chassis, and a voltage measuring unit measuring a voltage from the measuring circuit and an insulation resistance calculator configured to calculate the insulation resistance of the battery pack based on the voltage measured by the voltage measurer, wherein the insulation resistance calculator calculates the insulation resistance at a time of the battery pack when the calculated insulation resistance is less than a preset threshold.
  • the insulation resistance may be recalculated based on the voltage change amount.
  • a method of calculating battery resistance includes measuring a voltage by connecting a measuring circuit between one of a (+) terminal and a (-) terminal of a battery pack and a chassis, and measuring a voltage based on the measured voltage to calculate the insulation resistance of the battery pack, wherein the calculating of the insulation resistance of the battery pack is based on the time-dependent voltage change amount of the battery pack when the calculated insulation resistance is less than a preset threshold. Insulation resistance can be recalculated.
  • the apparatus and method for calculating battery resistance by connecting the measurement circuit only between one of the (+) or (-) terminals of the battery pack and the chassis, it is possible to reduce the size and cost of the battery management system.
  • FIG. 1 is a block diagram showing the configuration of a general battery pack.
  • FIG. 2 is a block diagram illustrating a configuration of an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • 3A is a diagram illustrating calculation of insulation resistance in a conventional battery pack.
  • 3B is a diagram illustrating an equivalent circuit for calculating insulation resistance in a conventional battery pack.
  • 4A is a diagram illustrating calculation of insulation resistance of a battery pack using the battery resistance calculating apparatus according to an embodiment of the present invention.
  • 4B is a diagram illustrating an equivalent circuit for calculating the insulation resistance of a battery pack using the battery resistance calculating apparatus according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating an OCV-SOC table (graph) of a battery pack for calculating insulation resistance in an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a method of calculating battery resistance according to an embodiment of the present invention.
  • FIG. 7 is a block diagram illustrating a hardware configuration of an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • first, second, first, or second used in various embodiments may modify various components regardless of order and/or importance, do not limit
  • a first component may be referred to as a second component, and similarly, the second component may also be renamed as a first component.
  • FIG. 1 is a block diagram showing the configuration of a general battery pack.
  • FIG. 1 it schematically shows a battery control system including a battery pack 1 and a host controller 2 included in the upper system according to an embodiment of the present invention.
  • the battery pack 1 includes a plurality of battery modules 10 that are composed of one or more battery cells and are capable of being charged and discharged, and the (+) terminal side or (-) side of the plurality of battery modules 10 .
  • a switching unit 14 connected in series to the terminal side to control the charging/discharging current flow of the battery module 10, and monitoring the voltage, current, temperature, etc. of the battery pack 1 to prevent overcharging and overdischarging and a battery management system 20 (eg, BMS) that controls and manages to prevent.
  • BMS battery management system 20
  • the switching unit 14 is a semiconductor switching element for controlling the current flow for charging or discharging of the plurality of battery modules 10, for example, according to the specification of the battery pack 1, at least one MOSFET or Relays, magnetic contactors, etc. may be used.
  • the battery management system 20 may measure or calculate the voltage and current of the gate, the source, and the drain of the semiconductor switching element in order to monitor the voltage, current, temperature, etc. of the battery pack 1 .
  • the battery management system 20 may measure the current of the battery pack 1 using the sensor 12 provided adjacent to the semiconductor switching element.
  • the sensor 12 may correspond to a voltage measuring unit to be described later.
  • the battery management system 20 is an interface for receiving measured values of the various parameters described above, and may include a plurality of terminals and a circuit connected to these terminals to process the received values. Also, the battery management system 20 may control ON/OFF of the switching unit 14 , for example, a MOSFET, and may be connected to the battery module 10 to monitor the state of each battery module 10 . .
  • the insulation resistance of the battery pack 1 is calculated through a resistance calculation program based on data measured using a measurement circuit connected to the battery pack 1 as described below. can be calculated.
  • the upper controller 2 may transmit a control signal for the battery module 10 to the battery management system 20 . Accordingly, the operation of the battery management system 20 may be controlled based on a signal applied from the upper controller.
  • the battery cell of the present invention may be a configuration included in the battery module 10 used in a vehicle or ESS (Energy Storage System).
  • the host controller 2 may be an ESS controller.
  • the battery pack 1 is not necessarily limited to this use.
  • FIG. 2 is a block diagram illustrating a configuration of an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • an apparatus 200 for calculating battery resistance includes a measuring circuit 210 , a voltage measuring unit 220 , an insulation resistance calculating unit 230 , and a storage unit 240 . can do.
  • the battery resistance calculating apparatus 200 shown in FIG. 2 may be a component included in the battery management system (BMS) of the battery pack.
  • BMS battery management system
  • the measurement circuit 210 may connect the measurement circuit between one of the (+) terminal and the (-) terminal of the battery pack and the chassis.
  • a chassis connected to the measurement circuit 210 may include a chassis provided in a vehicle.
  • the measurement circuit 210 may include a measurement resistor and a switch connected in series, and may be connected in parallel to the insulation resistance of the battery pack. Also, the measuring circuit 210 may further include a measuring resistor and a voltage dividing resistor connected in parallel to the switch. For example, the measuring resistance of the voltage measuring unit 220 and the switch may be respectively connected in parallel to the insulation resistance of the battery pack, and the voltage dividing resistor may be connected in parallel to one of the insulation resistances. In addition, the voltage division resistor may serve to divide the voltage of the measurement circuit 210 to adjust the voltage to a measurable level.
  • the voltage measuring unit 220 may measure the voltage from the measuring circuit.
  • the voltage measuring unit 220 may be a sensor of the battery management system connected to the voltage division resistor side of the measuring circuit 210 .
  • the insulation resistance calculator 230 may calculate the insulation resistance of the battery pack based on the voltage measured by the voltage measurer 220 . In this case, the insulation resistance calculator 230 may calculate the insulation resistance of the battery pack using at least one equivalent circuit according to the switching state of the switch included in the measurement circuit 210 . This will be described later with reference to FIG. 4B .
  • the insulation resistance calculator 230 may recalculate the insulation resistance based on the time-dependent voltage change of the battery pack.
  • a preset threshold eg, 100 k ⁇
  • the insulation resistance calculator 230 may recalculate the insulation resistance based on the time-dependent voltage change of the battery pack.
  • the measurement circuit 210 is provided on only one of the (+) or (-) terminals of the battery pack like the battery resistance calculating device 200 according to an embodiment of the present invention, insulation of less than a certain value due to asymmetry For resistors, the accuracy may be poor. Accordingly, in the battery resistance calculating apparatus 200 according to an embodiment of the present invention, the insulation resistance is calculated again through a separate method for the calculated insulation resistance less than the threshold in consideration of this limitation.
  • the insulation resistance calculator 230 may recalculate the insulation resistance by calculating the amount of change in capacity of the battery pack using the amount of change in voltage according to time of the battery pack. In this case, the insulation resistance calculator 230 may calculate the amount of change in capacity of the battery pack based on, for example, an OCV-SOC table pre-stored in the storage unit 240 .
  • the insulation resistance calculator 230 may calculate a leakage current from the capacity change amount of the battery pack, and recalculate the insulation resistance based on the voltage change amount and the leakage current of the battery pack over time.
  • the insulation resistance calculator 230 may calculate a voltage of a previous driving completion time of the battery pack (eg, a previous ignition-off time of the vehicle) and a driving start of the battery pack. Insulation resistance may be recalculated based on the voltage difference value at the previous time point (eg, the starting point of the vehicle).
  • the insulation resistance calculator 230 wakes up by the battery management system after a preset time elapses from the voltage at the time when the previous driving of the battery pack is completed and when the previous driving of the battery pack is completed. Insulation resistance may be recalculated based on the difference in voltages of the battery packs being increased. In this case, the preset time from the completion of the previous driving of the battery pack may be measured through a real-time clock (RTC).
  • RTC real-time clock
  • the insulation resistance calculator 230 may be various methods for the insulation resistance calculator 230 to recalculate insulation resistance when the insulation resistance is less than a preset threshold, and an exemplary process thereof will be described in detail later in FIG. 5 . .
  • the storage unit 240 may store various data such as voltage data measured by the voltage measuring unit 220 , insulation resistance data calculated based on the voltage data, the amount of change in capacity of the battery pack, and a leakage current value. Also, the storage unit 240 may store the OCV-SOC table. However, the battery resistance calculating apparatus 200 according to an embodiment of the present invention does not necessarily include the storage unit 240, but includes a communication unit (not shown) to transmit and receive data from the database of an external server through this. could be configured.
  • the apparatus for calculating battery resistance may further include an alarm unit (not shown).
  • the alarm unit may provide a warning alarm to the user when the insulation resistance calculated by the insulation resistance calculator 230 is out of a preset reference range.
  • the alarm unit may provide a warning alarm to the user in various ways, such as providing a warning notification as a visual signal through a lamp or generating a warning notification sound or message through a speaker. Accordingly, it is possible to protect the user from the risk of electric shock or the like occurring due to the insulation resistance.
  • the battery management system can reduce the size and reduce the cost. Also, according to the apparatus for calculating battery resistance according to an embodiment of the present invention, even if one section of the measurement circuit 210 is removed, performance substantially equivalent to that of the existing measurement circuit can be implemented.
  • FIG. 3A is a diagram illustrating calculation of insulation resistance in a conventional battery pack. Also, FIG. 3B is a diagram illustrating an equivalent circuit for calculating insulation resistance in a conventional battery pack.
  • R p and R n ( 10 ) represent the insulation resistance of the battery pack
  • R 1 and R 2 represent the measured resistance and the switch 110a of the measuring circuit
  • R m1 and R m2 are voltage division represents the resistance 110b.
  • a measurement terminal 110c is provided between the resistors R m1 and R m2 .
  • a measurement resistor and a switch 110a are connected to both (+) and (-) terminals of the battery pack, and the switches of both terminals are alternately turned on/off to control R 1 and The voltage of the battery pack was measured by sequentially connecting R 2 .
  • FIG. 3B an equivalent circuit for measuring a voltage by alternately turning on or off the switch on the side of the measurement resistor R 1 and the switch on the side of R 2 of FIG. 3A is shown.
  • the value measured at the voltage measurement terminal 110c and the formula for calculating the insulation resistance can be summarized and expressed as follows.
  • R p and R n are the (+) and (-) side insulation resistances of the battery pack, respectively, R1, R2 are the measured resistances of the measuring circuit, E is R m1 +R m2 , C is the battery pack voltage, and D is R m2 /(R m1 +R m2 ), A is the voltage on the terminal side for measurement of the equivalent circuit (a), B indicates the voltage on the terminal side for measurement of the equivalent circuit (b))
  • the insulation resistance can be calculated as follows.
  • the insulation resistance may be calculated by omitting the measurement resistance and the switch provided at one end of the battery pack.
  • FIG. 4A is a diagram illustrating calculation of insulation resistance of a battery pack using the battery resistance calculating apparatus according to an embodiment of the present invention.
  • FIG. 4B is a diagram illustrating an equivalent circuit for calculating the insulation resistance of a battery pack using the battery resistance calculating apparatus according to an embodiment of the present invention.
  • R p and R n ( 20 ) represent the insulation resistance of the battery pack
  • R 1 and R 2 represent the measurement resistance
  • R m1 and R m2 represents the resistor 210b for voltage division.
  • a measurement terminal 210c is provided between the resistors R m1 and R m2 .
  • the measurement resistance and the switch 210a are connected to only one of the (+) terminal and the (-) terminal of the battery pack, and the switch By controlling on/off to connect or disconnect R 1 , the voltage of the battery pack can be measured.
  • FIG. 4B an equivalent circuit for measuring a voltage by turning on/off the switch on the side of the measurement resistor R 1 of FIG. 4A is shown.
  • the value measured at the voltage measurement terminal 210c and the calculation formula of the insulation resistance can be summarized and expressed as follows.
  • R p and R n are the (+) and (-) side insulation resistances of the battery pack, respectively, R1, R2 are the measured resistances of the measuring circuit, E is R m1 +R m2 , C is the battery pack voltage, and D is R m2 /(R m1 +R m2 ), A is the voltage on the terminal side for measurement of the equivalent circuit (a), B indicates the voltage on the terminal side for measurement of the equivalent circuit (b))
  • the insulation resistance can be calculated as follows.
  • the size of the battery management system is reduced by connecting the measurement circuit only between one of the (+) or (-) terminals of the battery pack and the chassis. and can reduce costs.
  • the method for calculating battery resistance according to an embodiment of the present invention even if one section of the measurement circuit is removed, performance substantially equivalent to that of the existing measurement circuit can be implemented.
  • the battery resistance calculating apparatus since the battery resistance calculating apparatus according to an embodiment of the present invention omits one of the (+) or (-) terminals of the battery pack, the measurement accuracy is lower than that of the conventional method due to the asymmetry of the circuit. there is This problem is mainly conspicuous as the calculated insulation resistance value decreases.
  • a threshold for example, 100 k ⁇
  • the battery pack The insulation resistance can be recalculated by measuring the voltage for a certain period of time and calculating the leakage current. This will be described below.
  • FIG. 5 is a diagram illustrating an OCV-SOC table (graph) of a battery pack for calculating insulation resistance in an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • the x-axis represents state of charge (SOC) (%)
  • the y-axis represents open circuit voltage (OCV) (V).
  • the battery pack voltage (V 1 ) measured when the vehicle is turned off in FIG. 5 is 500V
  • the amount of change in capacity of the battery pack is 100 Ah for a total of 500 Ah.
  • the battery pack voltage difference was calculated at the time when the vehicle was turned off and when the vehicle was turned on again. Even when the pack is woken up, the insulation resistance can be calculated in the same way as described above.
  • FIG. 6 is a flowchart illustrating a method of calculating battery resistance according to an embodiment of the present invention.
  • a voltage is measured by connecting a measurement circuit between one of the (+) and (-) terminals of the battery pack and the chassis ( S110 ).
  • the measuring circuit in step S110 may include a measuring resistor and a switch, and may further include a voltage dividing resistor in addition.
  • the insulation resistance of the battery pack is calculated based on the measured voltage (S120).
  • the insulation resistance of the battery pack may be calculated using at least one equivalent circuit according to the switching state of the switch included in the measurement circuit. Since this has been described with reference to FIGS. 4A and 4B , a detailed description thereof will be omitted.
  • the calculated insulation resistance is less than a preset threshold (eg, 10 k ⁇ ) (S130). If the insulation resistance is equal to or greater than the threshold value (NO), the calculated insulation resistance is determined as a final value.
  • a preset threshold eg, 10 k ⁇
  • the insulation resistance may be recalculated based on the time-dependent voltage change amount of the battery pack. Specifically, first, a voltage change amount with respect to time of the battery pack is measured ( S140 ). In this case, the amount of voltage change with respect to the time of the battery pack is the amount of voltage change between the time when the previous driving of the battery pack is completed and the start of the next driving, or the voltage between the time when the battery pack is woken up after a predetermined time from the time when the previous driving of the battery pack is completed. The amount of change can be measured.
  • the amount of change in capacity of the battery pack is calculated based on the amount of change in voltage with respect to time of the battery pack (S150).
  • the amount of change in capacity of the battery pack may be calculated based on the pre-stored OCV-SOC table.
  • the leakage current is calculated based on the calculated amount of change in the capacity of the battery pack ( S160 ). Then, the insulation resistance is recalculated based on the voltage change amount of the battery pack calculated in step S140 and the leakage current calculated in step S160 ( S170 ).
  • the measurement circuit is provided only at one of the (+) or (-) terminals of the battery pack, so that accuracy is improved for insulation resistance less than a certain value due to asymmetry can fall Accordingly, in the battery resistance calculation method according to an embodiment of the present invention, more accurate insulation resistance can be calculated again through the methods shown in steps S140 to S170 for the calculated insulation resistance value less than the threshold value in consideration of this limitation.
  • the size of the battery management system is reduced by connecting the measurement circuit only between the chassis and one of the (+) or (-) terminals of the battery pack. and can reduce costs.
  • the method for calculating battery resistance according to an embodiment of the present invention even if one section of the measurement circuit is removed, performance substantially equivalent to that of the existing measurement circuit can be implemented.
  • FIG. 7 is a block diagram illustrating a hardware configuration of an apparatus for calculating battery resistance according to an embodiment of the present invention.
  • the apparatus 300 for calculating battery resistance may include an MCU 310 , a memory 320 , an input/output I/F 330 , and a communication I/F 340 .
  • the MCU 310 executes various programs (eg, a battery voltage measurement program, a battery insulation resistance calculation program, etc.) stored in the memory 320 , and through these programs, various programs for calculating the insulation resistance of the battery pack, etc. It may be a processor that processes data and performs the functions of FIG. 2 described above.
  • various programs eg, a battery voltage measurement program, a battery insulation resistance calculation program, etc.
  • It may be a processor that processes data and performs the functions of FIG. 2 described above.
  • the memory 320 may store various programs related to voltage measurement of battery cells, calculation of insulation resistance, and the like.
  • the memory 720 may store various data such as a measured voltage of a battery, insulation resistance data, a capacity change amount, a leakage current value, an OCV-SOC table, and the like.
  • the memory 320 may be a volatile memory or a non-volatile memory.
  • the volatile memory the memory 320 may be RAM, DRAM, SRAM, or the like.
  • the memory 320 as a non-volatile memory ROM, PROM, EAROM, EPROM, EEPROM, flash memory, or the like may be used. Examples of the above-listed memories 320 are merely examples and are not limited to these examples.
  • the input/output I/F 330 is an interface that connects between an input device (not shown) such as a keyboard, mouse, and touch panel, and an output device such as a display (not shown) and the MCU 310 to transmit and receive data. can provide an input device (not shown) such as a keyboard, mouse, and touch panel, and an output device such as a display (not shown) and the MCU 310 to transmit and receive data. can provide an input device (not shown) such as a keyboard, mouse, and touch panel, and an output device such as a display (not shown) and the MCU 310 to transmit and receive data. can provide
  • the communication I/F 340 is a configuration capable of transmitting and receiving various data to and from the server, and may be various devices capable of supporting wired or wireless communication. For example, a program or various data for voltage measurement and insulation resistance calculation of the battery pack may be transmitted/received from an external server provided separately through the communication I/F 340 .
  • the computer program according to an embodiment of the present invention is recorded in the memory 320 and processed by the MCU 310 to be implemented as a module that performs each functional block shown in FIG. 2 , for example. there is.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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  • General Chemical & Material Sciences (AREA)
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  • Tests Of Electric Status Of Batteries (AREA)

Abstract

La présente invention concerne, dans un mode de réalisation, un appareil de calcul de résistance de batterie comprenant : un circuit de mesure connecté entre un châssis et soit la borne (+), soit la borne (-) d'un bloc-batterie ; une unité de mesure de tension servant à mesurer une tension à partir du circuit de mesure ; et une unité de calcul de résistance d'isolation servant à calculer la résistance d'isolation du bloc-batterie sur la base de la tension mesurée par l'unité de mesure de tension, l'unité de calcul de résistance d'isolation pouvant recalculer la résistance d'isolation sur la base de la variation de tension du bloc-batterie en fonction du temps si la résistance d'isolation calculée est inférieure à un seuil prédéfini.
PCT/KR2021/010384 2020-09-22 2021-08-06 Appareil et procédé de calcul d'une résistance de batterie WO2022065676A1 (fr)

Priority Applications (4)

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US18/017,814 US20230280409A1 (en) 2020-09-22 2021-08-06 Apparatus and method for calculating battery resistance
CN202180057683.2A CN116194786A (zh) 2020-09-22 2021-08-06 用于计算电池电阻的装置和方法
JP2023504608A JP7475769B2 (ja) 2020-09-22 2021-08-06 バッテリ抵抗算出装置および方法
EP21872708.9A EP4174506A4 (fr) 2020-09-22 2021-08-06 Appareil et procédé de calcul d'une résistance de batterie

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KR20220038921A (ko) * 2020-09-21 2022-03-29 주식회사 엘지에너지솔루션 배터리 팩 내부에서 무선 통신 방법 및 그 방법을 제공하는 마스터 bms
CN117269803B (zh) * 2023-11-21 2024-02-06 江苏林洋亿纬储能科技有限公司 电储能系统电池簇电阻检测系统的无源测量系统及方法

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EP4174506A4 (fr) 2024-01-03
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US20230280409A1 (en) 2023-09-07
JP2023535441A (ja) 2023-08-17
JP7475769B2 (ja) 2024-04-30
CN116194786A (zh) 2023-05-30

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